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            "title": "Customer Placing the Largest Number of Orders",
            "titleSlug": "customer-placing-the-largest-number-of-orders",
            "content": "<p>Table: <code>Orders</code></p>\n\n<pre>\n+-----------------+----------+\n| Column Name     | Type     |\n+-----------------+----------+\n| order_number    | int      |\n| customer_number | int      |\n+-----------------+----------+\norder_number is the primary key for this table.\nThis table contains information about the order ID and the customer ID.\n</pre>\n\n<p>&nbsp;</p>\n\n<p>Write an SQL query to find the <code>customer_number</code> for the customer who has placed <strong>the largest number of orders</strong>.</p>\n\n<p>The test cases are generated so that <strong>exactly one customer</strong> will have placed more orders than any other customer.</p>\n\n<p>The query result format is in the following example.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nOrders table:\n+--------------+-----------------+\n| order_number | customer_number |\n+--------------+-----------------+\n| 1            | 1               |\n| 2            | 2               |\n| 3            | 3               |\n| 4            | 3               |\n+--------------+-----------------+\n<strong>Output:</strong> \n+-----------------+\n| customer_number |\n+-----------------+\n| 3               |\n+-----------------+\n<strong>Explanation:</strong> \nThe customer with number 3 has two orders, which is greater than either customer 1 or 2 because each of them only has one order. \nSo the result is customer_number 3.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Follow up:</strong> What if more than one customer has the largest number of orders, can you find all the <code>customer_number</code> in this case?</p>\n",
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            "exampleTestcases": "{\"headers\":{\"orders\":[\"order_number\",\"customer_number\"]},\"rows\":{\"orders\":[[1,1],[2,2],[3,3],[4,3]]}}",
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                    "lang": "MySQL",
                    "langSlug": "mysql",
                    "code": "# Write your MySQL query statement below\n",
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                    "lang": "MS SQL Server",
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                    "code": "/* Write your T-SQL query statement below */\n",
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                    "lang": "Oracle",
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                    "code": "/* Write your PL/SQL query statement below */\n",
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                "MySQL uses a different expression to get the first records other than MSSQL's TOP expression."
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            "sampleTestCase": "{\"headers\":{\"orders\":[\"order_number\",\"customer_number\"]},\"rows\":{\"orders\":[[1,1],[2,2],[3,3],[4,3]]}}",
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                "Create table If Not Exists orders (order_number int, customer_number int)",
                "Truncate table orders",
                "insert into orders (order_number, customer_number) values ('1', '1')",
                "insert into orders (order_number, customer_number) values ('2', '2')",
                "insert into orders (order_number, customer_number) values ('3', '3')",
                "insert into orders (order_number, customer_number) values ('4', '3')"
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